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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b603aebf2743f061c5d3feafc4a4d43570427e41d1ff52a24e616bd0743615f5' 
  AND token = 'SaxjW8gwoCSmljN5k9KC1v9XVwbZXGE31ew8PzvDlec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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