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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be69a8a1584cd3eee635dbb6d676b0793d9e4409078823a6ed05257b2fb8b3b' 
  AND token = '11yC6FhZmPNCxn3zzwQQnMGdPvSVefclJFv3jQxDXZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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