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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2514fcb67c8f0dfce029be96db52d479708c7e301670546e01b22626f59e225' 
  AND token = '2FMDnwuL4GHxMoMgaSiTJAQU5h7L0bbpZPEplgmA3Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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