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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7be8f000c5ef69719086aa74551cda6c7cb28887e4dcc6ce4c72df3db2afa7' 
  AND token = '/cl77T2+mHKCVTJD2pbV6dSPl8np0v2kaLFpKwk3Ztk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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