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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773e0580141d58d0bb316cbd0e9adcb335efef3f932565b47617f0ba6f9c8777' 
  AND token = '2Id3Xgio2BCfO2OjMWbmaQ3WYyIM417RsWDQ2YE0cYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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