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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6e52ce3e18f658df1e4cdd3dbdc44dedc782452c9e569ffe02f308314307df' 
  AND token = 'PNKBncuaQ3b7HjzNnxJznNgcwbVmRZS54eGd9jbTol4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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