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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec4db9340e054e004667af32180181e92103daccce16a10f78a5c88bdb5d5fa' 
  AND token = 'uBght4f17dynfY5i7vVLK4fCdgh2lT4e1nS2ZukY+LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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