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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b064bb61025df32120345ef391616903f0505ce49f41d3bc5ba0b9ba45e9f6c' 
  AND token = 'UV5paJo7spC3hE6OnOio787Z9WjJcasDvSsR4PbIT0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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