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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fff33a2c6afded29685a119abe7b70e309ca061ccc9da09e3ee81e96c0d33c7' 
  AND token = 'zTTUVjeJEvz2V6wx9OC8xQwhmLZ7JnpbEtyCWyDI6SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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