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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fedf39f8b4170fc0ed9f3a23718fb206621766ecda23e4c5d71844b2eadc7f7' 
  AND token = 'sHD9Vh6W+evKYyI8DvEUBnEZ7HbBy8IFyKUkljtx+Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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