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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80ce688bac97716c3b1857e44aee3814a79ca215d204818cd399385579b62e7' 
  AND token = 'VtuUx1Bjk2pVn6C1QSdk73TrDOzvPbDoPlR+QwV5w/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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