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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462ae41e7f37f159067da1e49f879b0c85e8f2dd8fe8802b2f36408acc480e11' 
  AND token = 'BdmemhWAm3LMQNwIM31vXZBXeRtJxiQOh5lkZFRLcvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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