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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3afdf207e61ce451d404bcf8a182a37e4f7ebc999102057534382403ff5d47' 
  AND token = 'zb/Osj357s8sguj12QxOK88HSytBaHBGx9VTNS53/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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