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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a7b80ed40a777ca19e81c50f77ddf256903dcdd6a1ebaadd8b927714dc8573' 
  AND token = '0crEjr4JGJDv/zb4SiH4CxmwqinFYYdyLmnAOTzH9ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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