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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836f331319003fe621129e5c8d1f120a5eea1842b345373a3d80984180ceb089' 
  AND token = 'eB2nQPpaD8I+eT3WAQ/H30jy22VtYcEkJk+4fv1Fghg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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