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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4479909fb3566a17523e60b7657354dce9eac671ed744f1eb89bd377c0e0f5e' 
  AND token = '//Z92rvaPrx81+WAt1c01kUecZwi5qZgMkjXDkiLPjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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