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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa51111fc70c572627e629ca82450cc0eb7bbb5eb3cfbaa7a70d3e4211d3ce0' 
  AND token = 'niqPbyKOeZJacnJbGSecXL4GO9+2W3lRTQ/+GsO3lJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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