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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d89ae6e20d7d61f098fd661cabcb9b6e0a071a87ea94d2e5eb2e317ad7b8b87' 
  AND token = '304mBz2onvAuyIXtRwaZgp63wrKRbRgRqHj45bm4cfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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