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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89ad469492e07ef9480fff4ab55861aee7ce563674eb220cf62dc9bddb389b0' 
  AND token = 'EKj0Cm24TuH3e182GT4LMxro2macked3K/D2Bhy3yE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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