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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951740ad219e28f5a4912e34a7d8c58ed5664e56666c2f4d9d4335daac1b8d51' 
  AND token = 'EzX7Ghcg/wEtyvRdVyK1ucEBa5On776pYYycnXfZ+lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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