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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c232a092bc6904dfb30c76d40f87f05b37f41be62c90608f788182b7d339d3' 
  AND token = 'MMDqreGMKYNl7QoBABu3i3g6P03sJo7yTt4rb20Gp20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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