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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303948a0d8473b2b484a63a61d22cabfc763bec2e859ec3f9c45c8014ccd1384' 
  AND token = '/fuRc6/Gz+c5o9qGD9vR7S6U5fPvKawGo5N3+je6QRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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