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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4880a06d1d09d82f7bc42b7e017216d2795f04c164907af0ec9087f6ae8ff7d2' 
  AND token = '9J4kGJ+DSHVjESraGciJfMsPaT/tg6wugKZFbCf5HnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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