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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105abc5ecd8c4cf032304583825051cd1786a6aab328216f1b6bb527f9c34bd3' 
  AND token = 'C2SSgzWv7CkKns2g9aSLGqdTNSMCU/RUG+RSkuQvvf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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