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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf13ddb625b5243b1fdc3e83ee6989dc29fa51da73c6f7af1bfab0aa6fb6fea8' 
  AND token = 'eKiRxvIvNExhxE/GgyxJo43VsfhcNkurlI7UZzGB76A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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