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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8be5d7c422c1d536aa22d74b34ee52ab1a6ba0eb9378a7289b9d147ae190d96' 
  AND token = 'isjBembUS5HSkOZRs6FV2c+dphIbV6VA89tVjrXkLb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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