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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e46ea59f798fe7c3357b5d3f5b46cb06489405388b115d646ca3f4083abb63' 
  AND token = 'xnmr2nckaLmjoXCp+2H1aY/SLFXTjwWvomy6Gn5noMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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