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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e2bbe01e39d3a1428430fae448a4d22dc9d42d8460213e9b7b6676dcdb10a8' 
  AND token = 'UFObKwluGg9E3fCC6BEEewL090LHNhJeN7//AZhJSEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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