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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac4956adedd76955d747f063927cd8e50aae363f601bc389c5162c9cad8a173' 
  AND token = 'VvV9oa5mrS8YyFY2VCK4cLwDUKQjL7SKQSBluMDLg3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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