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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32157292d992b3ef7af8651a0a7ec12660c38a9fb9b8223579e9b3dc57a0a70' 
  AND token = '9pMJegC1a9zESON+aJbWspTj3y+v/BPRLk2QXG3U4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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