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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34604dba8d3c61b8edd2d49419126aa1b8f989fcf2c9baf715914b73e3a686ae' 
  AND token = 'EZLA8CWD0Bk3LJ9Dcu5MeVAsuvST3Pxp5vI04unBkpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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