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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926c73a6e01299b5ee11d65a564aa8d109cf17c3e77366fa0b60d7aa5d3b9ae3' 
  AND token = 'dn93Zxfn2i7aKd2WTTvOAiizurDQKnFEVDZZdia15Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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