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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f46d7d8ed5369c17c0534486bf233fe684b483ab9f6aac0e2f8c84938f4347b' 
  AND token = 'Hy0SOV/M8ClrDqpF2OUVOpjktPeFSkpa++RN0JbKylU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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