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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dd4f8bc8b152a3541b0d4ab01bd01349220973f8f28d5f0f2568095fcd15c8' 
  AND token = '2CbMh+OpVhu76I9B4+LiJl65U8GAnZm5e9JDZsXc+Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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