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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9111cfe6bac4f58f2863d48db212b874e9f47d74f431ad4da635b5ae684d1d11' 
  AND token = 'gWi3gBomliaTe95NaCVH0Bm0rWj/hj1WWxPASTZkze4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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