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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99e563fd2900ea976bc0d4bcae64c2fb7da93b9257fda407f811c7520e28fe5' 
  AND token = 'vcTA2O6wr2C2Y/K+0wkM9/gmiAes3vm2Rtx3vNdF6xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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