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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d7dfc1cd009f7b0beff827f5a6c14824ce36af420b3fc78a31211c981e7cdb' 
  AND token = '+seCn71tLWgK0CoyKCE03pCkK3IE2Xz9dUzGtgcbT7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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