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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84ff30069173110bf65f708458738d0aa157d2e9f3388fdf9d4ef15676ab068' 
  AND token = 'w5VdCIuyVoTY7mw/VE8hRYu8BhJAUOfe60HMt3VuWSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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