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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4127e0ab89bf205c079e0707e7815dfd2e87ec9d1fbd51cfd7f812d5ff8eacde' 
  AND token = 'PASc81yn0mWfkEMWKAmhKtSQva6+V1L+x/J2vlLgMcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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