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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae5461176a276947bf1875c5a894887104b11664b7139c34adc83c93b31e8de' 
  AND token = 'kKWkdv9PUU70YQbsyyVvC8wi+S6DclnRsp/sHYij650=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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