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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab09a044d31d3f8d61997bfba281f8f3a54a4dea6c31162690eddef5dd748f5' 
  AND token = 'xx+f53aorxV6RN8eoAjUKeI4HMtFyGZW5ZBE3rMNIT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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