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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa96dab790e92aca121acf7c6d6e3dad140380d25001a0fa04210b83dab3d4e' 
  AND token = 'hFgj1wSfMMnTJrodY2488qttWtefY37CKgg9EP/zilg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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