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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318a1e379313586d2c8acb4249f8caac2b4624ba36bf4fce0e914ef673fa3f3c' 
  AND token = 'VmtKmMNCe6P513rW+QLcy4/3SuHBraJJSQ5JFKcriws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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