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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3656bff4da23e0ce6ff227db092cc24b12ee7e8f3b749d3ef2e7da9feb20d1b' 
  AND token = 'xhewr+G+RjDt7N/YdQakiQtxh8FS9PVoNHnp2yoMwtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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