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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507280b6b380f5b65847e0c35f61ad58c10b325e23e01295ca1dc1742c3ef4d0' 
  AND token = 'zz41M1a6cTIEx8V9qOgqG4HgFpz004c13gpOEpm6chA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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