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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f460e2a658b05abdab353abef4b7bb1aec23649101ac1c0f5b967d782063745' 
  AND token = 'WmCl4iFrVOQJJgh9G6B0d0yUsBJbnGUPfL4KIT6mNsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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