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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92247d63b2c223396ccd6698982d68fd99dab1a54daddcd9c5d21b9bc64b16b0' 
  AND token = 'tt6Uk9m0apmtOUg1Jm6NorX1lTt/UcVkmqa3UP2TSis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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