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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8ef56f1576fda6de2ba3f6de0de046833f504b6ef1a7b23254d9f617fc69d1' 
  AND token = 'H+gFWlc4aYbvkAuPna0lBWwlqk7qBUpsOEoC1kf8DsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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