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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0922bb79d3fa1e61bda930fe16995dab068290069a7c2c22c4e002ca7a2db6a2' 
  AND token = '510uZBd46DaN6AOdMAZscvHlrA86bYBVnP1pbGWa4cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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