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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5ba75fdf214e4d7c27cd8c0eef7ebd13560a3fda9fa5cca118bf2ad2e5d02f' 
  AND token = 'wH+/LYLHbtpzrW75cyrMPUIDxISQFvlUdLYp/h4C2UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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