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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfa0cf7fbec3fa3ad4bc9601f1f3a65dd5e53598d823e5c243e47cebd71b5fb' 
  AND token = 'MWWvd0SEl/Rj6Xb7UPBZHOvp2o8+zHA22fwSljSpAgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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