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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d70d8c67940f23b8f34922d66719cf3e80348f3dcca8b507e3af6eab0af0f32' 
  AND token = '4xfZrwyLOJ5/3vE0F+sXqnyatksEyEazepncJCVBB/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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