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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0885ac25d178b7087e4a93a24a2dca5037371b82238aa4c8ecf8b03b8f9e05c2' 
  AND token = 'Y4F8WhMU4SLa11c3LIu5GucHa47qPehKoVxRbb3+7r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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