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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0debf8fbbdd61422ef881d3a1bfd8e153d27c5e62f0eea4b3d3ef3482adc26eb' 
  AND token = 'UBrhsckhoxonXzno4GKKREU1GaL8Iu0KQ32bCYLIdFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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