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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83dedf601bdfd22b31e4ab5c4a06230033d036a96990e95d427d7b779eec42b' 
  AND token = 'SEHinwA3n7OOGOA1KWa+iURgKelL9A2Dxy0fVhHSYMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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