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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce241238a50d911544b484c052de0fadb4552e4018398ae3869c448f8e64f615' 
  AND token = 'SztHOrwldA6/n2oSULcLLcetJrj4e/GrMjVZUh8vf5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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