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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0419c5c632cd6b09a1d068ad95d541ba1026421c848ac8fc693006042af18d1a' 
  AND token = 'mYX6CQB3VmcCcIoB9ojx9O00NtvXChDf3zK195k8vak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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