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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3357247f95b2e52c9c232054e605a4ede7fb9c0e79e714b66cdd27794797a862' 
  AND token = 'b98VOz29e0XltfMoWolq60dLEdd3ypMFbM1IhPLL/aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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