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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82b017fe3aa98edebd44b8d8dd77da11ea8bd2c9a5e3e75715a5eca1f023d85' 
  AND token = '546fOv8AzZD4r5qsm2ofB4kSBtPdzR7mMXnOUdfSk30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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