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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5474cc2efb83330907cb9479ed3bb808a634355ce5ff3133a2320860ece78ae5' 
  AND token = '4X23tUqDBzJVaHYM9nNtgVuD+n+d4QWF1cME0JVmffY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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