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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96952d3e3911ae02267fc33d469366438789851aef57a6c423ee35ba8a9d9685' 
  AND token = '7Ldj9PMTI5dIEcFQiW5bBMkxyB1c9su8qI8UUtl4rpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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