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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d260a006a232f1e951265cfcb81b3dd1793a52ce91ed40e96f5b412377993a' 
  AND token = 'j6qh34NSu7VMkWV7ys2z6bL9ATXoMn8pvOvF13CCorI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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