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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae08f5f3be939f671174e211d3a6aab514ed14999f2ab958398902a7ae31318e' 
  AND token = '6EiTlHC9jAULsq7eQTwWUHaudBkcKojL+1RmE15Y+xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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