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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fd72c3f23f802f0089e15b8d0ab3ac400d7d288783799d561a8d4b6973fc10' 
  AND token = 'bfbL5b4jItGCwofSko1SChSgqaHCY2z4PLhZtEQduFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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