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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf23f1c6f5427c5a7894f791e4f623df66b99c0bf5569ed87f2bb8c5c91125d0' 
  AND token = 'b03kT6jAPE76eXGylv/yx/SEqpiV8Asm1wO6yOi87fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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