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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52438f09c8f91d2b39c44544804a4c823d3f3ceea2f20805a0167c6c7cbc9cbf' 
  AND token = '8QrC12EdK/zNb5FoPHTxoAQ/KWWa39NiIlaQflUksUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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