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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9abde5b7f6e866e44cf8cb554e614b7ffec8fa84f1cb300ff7def70b4b2f4a' 
  AND token = 'gUKyyn3JKrCZ0S3cVWRM30y5DF4ZOPh0U+Q6MOnxTXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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