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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261ee6f15433c92a866d3617ed17cfbc126c457de5f3590c182700497032e7a6' 
  AND token = '/7f0oDafDDRX3N4haqHxZYqM3YUywMgb3uxPR+2gNcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}