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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addb243fd44d0f5f14f7849023a4104c0a741840834a423a1d3a73ccc069cdc7' 
  AND token = 'ko/f2c1mRExpit+aqrxHvFrJTvUaXGKKv1SnP//dacE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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