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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f66358139c77c7a8cc19f97ee0231004cb83c951c6a91af43b7f3a6204ba38' 
  AND token = 'T+D2/OGXjnInpZmtpi/a26+ldb99Idz7GHtclTY2WN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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