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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f93fff32ed075eb62b10e30fee1438dfceb11abc16eff732f2eddcfcee8741' 
  AND token = 'y2Dq50vG/joVBPmVrBSCm0A8OxgRY45LL0f2M5smy5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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