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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0af4226e7fc825547a7991ef344a38ebb62709c66871a0970a65f39805c839' 
  AND token = 'iiEhL2xTHsbn6BbU29i8j10gus5kl11Mk8MBrHLM3J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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