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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4e4fee6ceffa4dbb5c10fcc2efbe34e66760a1b84b3e1b9cc48d823ab51bb6' 
  AND token = 'RZfdNNJtGR1E9su5ArWoEqykvFDsGrTv3SyE/3uTB9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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