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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b6388fa33bc05e7fed06f3abc5f9f7249439a0783896aac26d5594dbb28a55' 
  AND token = 'QTpvMcYs6hQoQqO3KM4nkbcrYBRxFLzHHzRyfi7x3zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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