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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e3dabe0aeb0a55ef056c27393f032950cd2c03aacd00c06ff4b5b332567757' 
  AND token = 'D4nDKRJL0y5NsaXMk48Y0aPrnw85boVggaoHtrZ8Y/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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