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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa4b4263bc1080f1b5613f58419b7478891c3d53386d41db5cca734c1c70c50' 
  AND token = 'wBv+FbStYvgAjifEeod87gTf/kvtQIMV+q9wuSZDR1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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