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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36acb788ec9e3d3146f76090e5edac6edcb54b5ab1063c5a97d965d69fcba37e' 
  AND token = '9xc/VNLkZDJOIVOpibomCer3ae2cuCkObou5LTxKmio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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