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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff6e00737ac291c982baa70d3b73f4803b2cd599a91364a71b033eac09b87dd' 
  AND token = 'mEBXgX3O7ml+kRFk6CJ2AFleaEL4LGZx67WCPvp1GRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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