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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afab6b84b698d6057f6c5ca4b452fce09683da57cb8b3d888263f8542aff4a4' 
  AND token = 'OjQ9Jo31KOnDf0v12GdnevlXqlkac8Aw5RPLG3F4c0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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