SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d04bff83a25375c3ae862f883ae580109b0d61a86ac8dbeda5f5945c3eb5e3' 
  AND token = 'J/VpMXgwyjPb7gLHCLWh2KHimTOMkzzf8prFgrHB2GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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