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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3cdecee45b70eac5475c991caa24bcc1dcffd925582a77b85f8e624a59047e' 
  AND token = 'uNcXi3xzUEYTPfHxG6B4545k5iqjF4Hsszi/G7kRTus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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