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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fd34eaeb5349273303d866a16f2a53581432f4564ff7f51fcec480fd64c8f9' 
  AND token = '5oFsJdxVEz/2itqOb2F4zhqeeTOj1E0DMp7huAARByQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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