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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb0e3e62c8eddbd72d5a0d4dbf239d2ac7fa18a3d3de38937fa05a879eab177' 
  AND token = '57Ch8bAugQJFcXrV5cqKG5M6XwsNjuFvLcluB6XlO98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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