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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11720691395c59bf0e285681fbc1642cbd705a6f785938ff05404c1fe7b40586' 
  AND token = 'y26kq9dKpj3U1p9n6EXBs1V6SGsyk11sXcj8BzKieaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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