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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7307a327b3e86a7dd45938120307cc4b0a30b863af974e36ca6a6027907d1c3' 
  AND token = 'S8DGPcxdD/y0oY3lxW4ruKJML7GjGsxVQVwX8KPxbqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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