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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41073db1f58c39355b72ef12ab085f0937d2c1f40b9f981999c9c48b4ee52f55' 
  AND token = 'UVR4ldHKLT1wDHJgGR0mra5wHsrV0YGNUskQCu8s9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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