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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc5756c1c49f49328fd270e14202e83c1a6cc3e032fc7508c27f0f4fbda44de' 
  AND token = 'tIHHFsexHa3SiXOxjTu0ITU5n7jnY/EhLu5wuetwXQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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