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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a97417dece2aa990649a4dc769b6aa5fa74a9c4926d76a846a9c4bb861129c' 
  AND token = 'ys4mNQoXmdZ3ubV0yN+WX/29aBgJ/KV9mxbSFaKfs5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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