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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c108c1ba70b64eb92551c11fab24c60739ce768020f320d16b18c15fe0c168c' 
  AND token = '5Z0U6o1rXO7RU39v7Fqz1XfwdCU+LVWn2BPJrmd+t7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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