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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35b6ab5563f15e10a2bbd4a62c8fc86ff7d1a11aab7652522f4b360c0365330' 
  AND token = '5sbOYKMKr8lJenvxhIVEkE7Vbbrc1XXZKpv4GzvV57A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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