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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b59330f667cae7ff7bc18cfb0a4adab485a75291caa8d7506ff5bec8b4aaf8c' 
  AND token = 'nzzeDC6e3WMUHW7INy4DFgdR1I4ImYlEmfBat/xPpA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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