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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f2e015633a5845c9d33da0e72f46d8952dce288535a66ce4968bd96215ca90' 
  AND token = 'rr0LNmM5G8ogePeMWgqSZ64Tn/LQ14S7QEfsH7ggLXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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